We look at the division of 424668 by 15 
The aim is to understand the frequency of 15 in 424668.

Going ahead to step 1:
15 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 15

Going ahead to step 2:
42 divided by 15 is 2 with a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 30 away from 42, we end up with 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 15

Advancing to step 3:
If we divide 124 by 15, we get 8 and a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 28.0
If we subtract 120 from 124, we get 4.
Fetch the next digit (6) from the dividend, attach it to 4 and continue: 46 / 15

Let's proceed to step 4:
If we divide 46 by 15, we get 3 and a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 283.0
If we subtract 45 from 46, we get 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 15

Moving on to step 5:
16 divided by 15 is 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 2831.0
Subtract 15 from 16 to get 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 15

Let's proceed to step 6:
When dividing 18 by 15, we get 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 28311.0
The remainder is 3 after subtracting 15 from 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
30 divided by 15 is 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 28311.2
If we take 30 away from 30, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
If we divide 0 by 15, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 28311.2
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 28311.2
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 28311.2, and the remainder is 0.0.